EP3200950B1 - Mehrschichtiges stahlflachprodukt und daraus hergestelltes bauteil - Google Patents

Mehrschichtiges stahlflachprodukt und daraus hergestelltes bauteil Download PDF

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Publication number
EP3200950B1
EP3200950B1 EP15760110.5A EP15760110A EP3200950B1 EP 3200950 B1 EP3200950 B1 EP 3200950B1 EP 15760110 A EP15760110 A EP 15760110A EP 3200950 B1 EP3200950 B1 EP 3200950B1
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Prior art keywords
steel
alloy
steel alloy
flat
product
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German (de)
English (en)
French (fr)
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EP3200950A1 (de
Inventor
Jens-Ulrik Becker
Stefan Myslowicki
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/04—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B23K20/227—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded with ferrous layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/007—Layered blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/16—Composite materials, e.g. fibre reinforced
    • B23K2103/166—Multilayered materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2251/00—Treating composite or clad material
    • C21D2251/02—Clad material

Definitions

  • the present invention relates to an at least five-layer steel flat product, as defined in claim 1, consisting of a plurality of steel alloy layers bonded to one another by hot rolling, a steel of a first steel alloy in at least one of the steel alloy layers and a steel of a second steel alloy in at least another of the steel alloy layers. which is different from the first steel alloy, wherein the steel of the first steel alloy is a steel with high strength and the steel of the second steel alloy is a steel with lower strength and a lower carbon content (than the steel of the first steel alloy).
  • the invention further relates to a component for a vehicle component according to claim 10.
  • flat steel product is understood here to mean steel sheets or steel strips produced by a rolling process, as well as plates and the like separated therefrom.
  • components that are produced by hot forming and then hardening of flat steel products made of a manganese-boron steel have become established here for crash-relevant automotive components.
  • This manufacturing method also known in technical terms as press hardening, enables components to be produced which, despite optimally thin walls and the associated minimized weight, can be used on points of a vehicle body that are particularly sensitive to their behavior in the event of a crash.
  • the present invention is not only limited to the automotive industry, but can generally be used in industrial applications. In all areas, but especially in the automotive area, locally different demands are made on the components with regard to the material properties.
  • the material properties include strength and ductility.
  • “Local” means that different requirements are placed on a first section of the component than on a second section. Since these requirements can also be contradictory, a solution with singular construction materials is the same throughout Material properties have a maximum compromise of all individual requirements. It is therefore not only in the course of lightweight construction efforts in automotive engineering that tailor-made materials are increasingly being used, which enable components to be optimized through locally different material properties, for example in terms of their weight by reducing the sheet thickness.
  • the longitudinal direction is also referred to as direction X
  • the transverse direction also as direction Y
  • the direction of the sheet thickness also as direction Z.
  • a multilayer steel flat product consisting of a plurality of interconnected steel alloy layers with at least one core layer is described, for example, by DE 10 2007 022 453 A1 ,
  • the core layer should consist of a soft, easily deformable steel alloy, whereas the outer layers of the flat steel product should consist of a high-strength steel alloy.
  • TriBond® - three layer steel composite for hot forming
  • the flat steel product is intended for the production of a component for a vehicle body, which is hot-formed and hardened.
  • layers of high-strength steel alternate with layers of steel with a lower strength and a lower carbon content, in particular within individual layers, for example in an intermediate layer between a core layer and in each case one of the outer layers (cover layers), with sections of a steel with high strength and a steel with lower strength and less carbon alternating.
  • Sections with such different steel alloys or different carbon proportions can be arranged directly next to one another in the longitudinal direction (direction X) and / or in the transverse direction (direction Y) and / or in the direction of the layer structure (direction Z), that is to say they adjoin one another and / or alternate.
  • Steels with high strength in the sense of the invention are steels made of a steel alloy according to claim with a carbon content of at least 0.2% by weight and up to 0.5% by weight, which in the final state (hardened) have tensile strengths of at least 1200 MPa, in particular at least 1350 MPa, preferably at least 1450 MPa. They are defined in DIN EN 10083, for example manganese-boron steels.
  • a function-optimized modeling of local material properties in all directions of sheet metal blanks is made possible in this way.
  • the material properties set in a material composite are largely determined by the choice of combined composite partners and their proportion and distribution in the direction of the sheet plane and / or sheet thickness.
  • slabs, blooms, pre-strips or blanks (flat steel products) of the participating composite partners with a constant cross-section are placed on top of one another and connected to one another in particular by roll cladding.
  • the setting of composite properties that vary in the sheet metal level is achieved in particular by an inhomogeneous distribution of the composite partners involved.
  • the carbon content of the steel of the first steel alloy with high strength has a value in a range of 0.20-0.50% by weight, preferably in one Range of 0.20-0.45% by weight, and / or the carbon content of the steel of the second steel alloy with low strength, ie which has the lower carbon content, a value in a range up to 0.15% by weight, preferably in a range from 0.02 to 0.15% by weight, particularly preferably in a range from 0.02 to 0.11% by weight.
  • the carbon content of the steel of the first steel alloy can be 0.22% by weight and the carbon content of the steel of the second steel alloy can be 0.10% by weight.
  • the flat steel product consists of an odd number of steel alloy layers.
  • the flat steel product preferably consists of five steel alloy layers.
  • the flat steel product has a core layer, intermediate layers directly adjoining it on both sides and an outer layer (cover layer) adjoining the outside of each intermediate layer.
  • the flat steel product preferably has a core layer which consists of a steel alloy layer with the steel of the first steel alloy with high strength (with the higher carbon content). Furthermore, at least one steel alloy layer is preferably provided on both sides of the core layer, which consists of at least one steel alloy layer with the steel of the second steel alloy with low strength (with the lower carbon content).
  • the core layer can consist entirely of the first steel alloy with high strength (with the higher carbon content) and / or the outer layers (meaning the two that form the outer sides Top layers) can consist entirely of the second steel alloy with low strength (with the lower carbon content).
  • sections made of the first steel alloy and sections made of the second steel alloy can alternate or be arranged next to one another, specifically in the direction X and / or in the direction Y and / or in the direction Z, in principle, only one and the same steel alloy can be provided completely in the intermediate layers.
  • the individual sections are given different material properties from the different steel alloys in that individual sections have high strengths and other sections have lower strengths.
  • a steel with lower strength is used as the second steel alloy, there is no to slight hardening in this section during press hardening, but only the sections in the flat steel product that are made of hardenable steel are hardened.
  • the at least one steel alloy layer with the steel of the first steel alloy with high strength, in particular the core layer, and / or the at least one steel alloy layer with the steel of the second steel alloy with low strength, in particular at least one of the outer layers consist of the same steel. It is further provided that the at least one steel alloy layer with the steel of the first steel alloy and the at least one steel alloy layer with the steel of the second steel alloy have at least one section made of steel from the respective other steel alloy. It is conceivable that in the longitudinal direction and / or in the transverse direction and / or in the direction of the layer structure, a section made of steel of the first steel alloy is adjacent to a section made of steel of the second steel alloy.
  • the core layer takes up 30-90%, in particular 50-80%, of the thickness of the flat steel product. Even in the case of a hot-formed / press-hardened component produced from a flat steel product according to the invention, it is preferred if the core layer occupies 30-90%, in particular 50-80%, of the total thickness of the steel sheet of the component.
  • the thickness ratio of the top layer to the core layer can be set depending on which property of the steel flat product according to the invention is to be emphasized.
  • the core layer is preferably fundamentally thicker than a single one of the remaining layers.
  • the core layer takes up 50% and each of the four remaining layers each 12.5% of the total thickness of the flat steel product or sheet steel of the component.
  • a corresponding flat steel product is suitable, for example, as a semi-finished product for a side member in automobile construction.
  • the thickness of the core layer can be chosen to be even greater, for example 70% of the total thickness of the flat steel product or take sheet steel of the component, the remaining four layers then taking up 7.5% of the total thickness, for example.
  • a corresponding flat steel product can be used, for example, as a semi-finished product for B-pillars in automobile construction.
  • all steel alloy layers are bonded to the adjacent steel alloy layer (s) by hot rolling or roll cladding.
  • a steel which can be used in practice for the core layer or the steel of the first steel alloy consists according to the invention in addition to iron and impurities which are unavoidable in production (in% by weight)
  • the impurities include P: up to 0.03%, S: up to 0.03%, Cu: up to 0.1%, Mo: up to 0.05%, N: up to 0.02%, Ni: up to 0.1%, Nb: up to 0.2%, V: up to 0.01%, Sn: up to 0.03%, Ca: up to 0.01%.
  • one of the outer layers or both outer layers or one or both intermediate layers of a flat steel product according to the invention or the steel of the second steel alloy consists of a steel which in addition to iron and production-related unavoidable impurities (in% by weight) C: up to 0.15%, in particular 0.02 - 0.11, Si: up to 0.7%, in particular 0.01 - 0.6%, Mn: 0.10 - 1.9%, especially 0.13 - 1.8%, al: up to 0.6%, in particular 0.001 - 0.2%, Cr: up to 0.6%, in particular 0.025 - 0.5%, Nb: up to 0.5%, in particular 0.002 - 0.2%, Ti: up to 0.5%, in particular 0.02 - 0.3%, consists.
  • the impurities include P: up to 0.25%, S: up to 0.15%, Cu: up to 0.15%, Mo: up to 0.05%, N: up to 0.06%, Ni: up to 0.15%, V: up to 0.02%, B: up to 0.01%, Sn: up to 0.04% and Ca: up to 0.03%.
  • the object is further achieved by a component, in particular for a vehicle body, produced by hot forming / press hardening of a flat steel product as defined above.
  • a component in particular for a vehicle body, produced by hot forming / press hardening of a flat steel product as defined above.
  • at least the steel with the relatively high carbon content i.e. the steel of the first steel alloy
  • receives its high strength in the final state
  • a component can be, for example, a side member or a B-pillar of a motor vehicle.
  • the core of the present invention is an at least five-layer steel material composite, which in particular comprises a core layer which consists of a hardenable steel material.
  • a core layer which consists of a hardenable steel material.
  • sheet metal / slab packages are put together as required and hot-rolled to a required (final) thickness, if necessary cold-rolled, annealed and / or surface-finished.
  • a combination of steel materials with high and low strengths, in particular with different carbon content, makes it possible to provide components with locally different strengths and bending angles that can be manufactured in a conventional hot forming line, i.e.
  • the semi-finished products are completely austenitized and hot formed in cooled tools and / or press hardened.
  • An additional tempering can take place after the (press) hardening.
  • the combination of materials in the semi-finished product allows areas with different properties to be set in a targeted manner without having to carry out tailored tempering before, during or after hot forming.
  • FIG. 1a schematically shows a cross-sectional view of a component 5 for a vehicle body, for example a B-pillar, produced by hot forming / press hardening of a corresponding flat steel product 1.
  • Examples of flat steel products 1 are shown in FIGS Figures 1c ) and d) and 2 shown.
  • Fig. 1b schematically shows another component 5 for a vehicle body, for example a vehicle side member.
  • This component 5 is also produced from a flat steel product 1 according to the invention in the manner described.
  • the component 5 and the underlying steel flat product 1 consists of a plurality of interconnected steel alloy layers: a core layer 2, two outer cover layers 3a and 3b and intermediate layers 4a and 4b arranged between the cover layers 3a and 3b and the core layer 2.
  • the component 5 here has a five-layer structure.
  • the core layer 2 here consists of a hardenable steel with high strength (in the final state) with a relatively high carbon content, whereas the outer layers 3a and 3b do not consist of a hardenable or only slightly hardenable steel with lower strength, which has a lower carbon content than that Have core layer 2.
  • the intermediate layers 4a and 4b each have a section 4a.1 or 4b.1 made of a steel with a relatively small thickness Carbon content, as well as a section 4a.2 or 4b.2 from a steel with a relatively high carbon content.
  • the carbon content has a value in a range of, for example, 0.20 to 0.65% by weight and is in particular 0.22% by weight. %.
  • the carbon content has, for example, a value in a range of less than 0.20% by weight and is in particular less than 0.15 wt .-%.
  • the core layer 2 consists of a hardenable steel with a high carbon content
  • the other layers 3a, 3b, 4a and 4b in the lower area consist of another steel with lower strength and a lower carbon content.
  • both the core layer 2 and the intermediate layers 4a and 4b consist of hardenable steel with a relatively high carbon content, whereas only the outer layers 3a and 3b consist of a steel with lower strength and a lower carbon content.
  • component 5 in FIG Fig. 1a the core layer 2 thicker than in the component 5 in Fig. 1b ) is.
  • the thickness ratio in Fig. 1a (from the left outer layer to the right outer layer) is for example 10: 10: 60: 10: 10.
  • the thickness ratio in Fig. 1b ) is for example (from the top outer layer to the bottom outer layer) 12.5: 12.5: 50: 12.5: 12.5.
  • the layer thicknesses of the two outer layers 3a and 3b are identical.
  • the layer thicknesses of the two intermediate layers 4a and 4b are also identical here.
  • the layer thicknesses of the outer layers 3a and 3b are identical to the layer thicknesses of the intermediate layers 4a and 4b.
  • the outer layers 3a and 3b and / or intermediate layers 4a and 4b can be of the same thickness and in particular thinner than the core layer 2.
  • a flat steel product 1 is shown schematically in a perspective view.
  • Fig. 1d shows a schematic sectional view of component 1 along the line in FIG Fig. 1c ) shown section line Id-Id (the view in Fig. 1d ) is thus seen in the rolling direction or in the direction X).
  • Fig. 1c it can also be seen that also in the upper layer 3a in, for example asymmetrical, regions Sections of different steel alloys can be provided. These symmetrical or asymmetrical sections can also be provided in one or more other layers, for example in the lower layer 3b.
  • Fig. 2 finally shows schematically further variants of a flat steel product 1, wherein it can be seen that both the core layer and each intermediate layer can consist of sections of different steel alloys. Some of the sections have a hardenable steel with a relatively high carbon content, whereas other sections have a steel with a relatively low carbon content.
  • the individual sections of the core layer are labeled "K0 ... K9”, the various sections of the intermediate layers are labeled "Z1.0 ... Z1.9” or "Z2.0 ... Z2.9".
  • the cover layers are designated here with "D1" or "D2" and always consist entirely of the same steel alloy.

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KR20170063852A (ko) 2017-06-08
CN106794671A (zh) 2017-05-31
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